Re: [Xen-users] Me vs. RHEL 2.6.18-53.1.4.el5xen

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Steven Timm wrote:
> On the first try of changing the xen.cfg to use xvda rather than
> sda, I forgot to change the "root" clause to also point to xvda.
> Now my domain is up under el5xen kernel but it has no network--
add "alias eth0 xennet" in /etc/modprobe.conf and reboot.

> nevertheless this is progress.
>
> Still, does anyone know--under red hat should I be using the .el5xen
> or the .el5PAE kernel for the guest?
The former.

--Sadique
> Thanks
>
> Steve Timm
>
>
>
> On Wed, 12 Dec 2007, Steven Timm wrote:
>
> > On Wed, 12 Dec 2007, Sadique Puthen wrote:
> >
> > > How did you create your initrd image?
> > >
> > > Recreate it using  --preload=xenblk --with-xennet. Change the disk 
> > > line as below.
> > > disk = [ 
> > > 'phy:LG0/LV1,xvda,w','phy:LG0/LV2,xvdb,w','phy:LG0/LV3,xvdc,w' ]
> > > Then try to start the guest.
> > >
> > > --Sadique
> > I did not have these options in the initial initrd.  I remade the
> > initrd for 2.6.18-53.1.4.el5xen and got the same error as before,
> > it couldn't find the /dev/root.
> >
> > Should I have done the 2.6.18-53.1.4.el5PAE kernel instead?
> >
> > Does it matter that I am doing the mkinitrd while in chroot
> > to a 32-bit distro, but still actually running a 64-bit kernel?
> > Is the 3ware controller a problem here? (I presume that I was 
> > supposed to change the /etc/fstab of the
> > FS of the xen instance as well, I did so).
> >
> > I tried to change the other .cfg file with the older
> > xensource kernel to use xvda, xvdb, etc and now that won't start
> > either.  I get the error "device xvda (51712,vbd) is already connected),
> > due, no doubt, to earlier things which tried to use the device
> > crashing and not closing it properly.  Any way to get around that?
> >
> > Thanks
> >
> > Steve Timm
> >
> >
> >
> > > Steven Timm wrote:
> > > > <flxi05> grep -v ^# xen1.cfg
> > > >
> > > > kernel = "/linux32/boot/vmlinuz-2.6.18-53.1.4.el5xen"
> > > > ramdisk = "/linux32/boot/initrd-2.6.18-53.1.4.el5xen.img"
> > > > memory = 4000
> > > > name = "fcdfx41"
> > > > vif = [ 'mac=00:16:3e:0C:04:01, bridge=xenbr0', 
> > > > 'mac=00:16:3e:0C:04:09, bridge=xenbr1' ]
> > > > disk = [ 
> > > > 'phy:LG0/LV1,sda1,w','phy:LG0/LV2,sda2,w','phy:LG0/LV3,sda3,w' ]
> > > > netmask= "255.255.255.0"
> > > > gateway= "131.225.240.200"
> > > > hostname= "fcdfx41.fnal.gov"
> > > > root = "/dev/sda1 ro"
> > > > extra = "4"
> > > >
> > > > ----------------
> > > > I am using the kernel inside dom0 to try to boot the domU.  That is
> > > > what I have done on all my installations up until now.  But I am 
> > > > willing
> > > > to change if someone finds a better way.
> > > >
> > > > I also tried to install a different Xen instance from scratch using
> > > > virt-manager, but it did get up to installing about ten rpms before it
> > > > quit, i.e. it got through the whole anaconda input phase of the 
> > > > install.
> > > > Steve Timm
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > ------------------------------------------------------------------
> > > > Steven C. Timm, Ph.D  (630) 840-8525
> > > > timm@xxxxxxxx  http://home.fnal.gov/~timm/
> > > > Fermilab Computing Division, Scientific Computing Facilities,
> > > > Grid Facilities Department, FermiGrid Services Group, Assistant 
> > > > Group Leader.
> > > > On Wed, 12 Dec 2007, Sadique Puthen wrote:
> > > >
> > > > > Can you please show your guest configuration file?  Are you using 
> > > > > a kernel and ramdisk from the dom0 to boot the guest or are they 
> > > > > put inside guest filesystem and using pygrub to load them from guest?
> > > > > --Sadique
> > > > >
> > > > > Steven Timm wrote:
> > > > > > I am trying to migrate an existing working xen setup
> > > > > > which was based on xen 3.1.0 tarballs as they were available
> > > > > > at xen.org.  Underlying distro is RHEL5.
> > > > > > I am now trying to use the not-really-xen3.1.0-but-almost
> > > > > > xen that comes with RHEL5 update 1.
> > > > > >
> > > > > > Host was 64-bit dom0.  first domU was PAE 32-bit, both from xen 
> > > > > > 3.1.0 tarballs.
> > > > > > Now I have installed kernel-2.6.18-53.1.4.el5xen on the dom0.
> > > > > > That boots up fine.  I tried to start up the domU first with
> > > > > > the old 2.6.18-xen kernel (32-bit PAE) that was working before.  
> > > > > > That
> > > > > > also started up OK, although it did crash once.
> > > > > >
> > > > > > The question is--how to get the 32-bit PAE kernel from
> > > > > > RedHAt installed and booting in the domU.  I tried both
> > > > > > 2.6.18-53.1.4.el5xen (32bit) and 2.6.18-53.1.4.el5PAE (32bit)
> > > > > >
> > > > > > the former cannot find the root system file system of the domU. I 
> > > > > > get the following error:
> > > > > > mount: could not find filesystem '/dev/root'
> > > > > > Setting up other filesystems.
> > > > > > Setting up new root fs
> > > > > > setuproot: moving /dev failed: No such file or directory
> > > > > > no fstab.sys, mounting internal defaults
> > > > > > setuproot: error mounting /proc: No such file or directory
> > > > > > setuproot: error mounting /sys: No such file or directory
> > > > > > Switching to new root and running init.
> > > > > > unmounting old /dev
> > > > > > unmounting old /proc
> > > > > > unmounting old /sys
> > > > > > switchroot: mount failed: No such file or directory
> > > > > > Kernel panic - not syncing: Attempted to kill init
> > > > > > -----------------
> > > > > >
> > > > > > If I compare between the 2.6.18-xen kernel from xensource which
> > > > > > works, and this one that doesn't, I see that I am missing
> > > > > > the modules ide-disk.ko, libusual.ko, usbcore.ko, usb-storage.ko
> > > > > > The usb modules should be irrelevant since there is no usb on 
> > > > > > this machine.
> > > > > > alas, the ide-disk.ko module which seems to be the key one isn't 
> > > > > > even
> > > > > > there at all in the redhat ersion of the kernel.
> > > > > >
> > > > > > ----------------------
> > > > > >
> > > > > > If I try to load the PAE version of the kernel instead, I get the 
> > > > > > following error message:
> > > > > > VmError: (2, 'Invalid kernel', 'xc_dom_parse_elf_kernel: ELF 
> > > > > > image has no shstrtab\n')
> > > > > >
> > > > > > Any clue what may be going on?
> > > > > > Does anyone else have a RHEL 5 update 1 system working with 
> > > > > > 64-bit host,
> > > > > > 32 bit PAE guests?
> > > > > >
> > > > > > Thanks
> > > > > >
> > > > > > Steve Timm
> > > > _______________________________________________
> > > > Xen-users mailing list
> > > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > > http://lists.xensource.com/xen-users

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